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 Details for Arlington Cnty, VA Coastal Flood Advisory
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 Details for Falls Church, VA Coastal Flood Advisory
 Montgomery Cnty(C+SE), MD
 Details for Montgomery Cnty(C+SE), MD Test Message
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 Details for Montgomery Cnty(NW), MD Test Message

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Coastal Flood Advisory COASTAL FLOOD ADVISORY - Alexandria, VA  - Arlington Cnty, VA  - Falls Church, VA  - Washington, DC
Test Message TEST MESSAGE - Montgomery Cnty(C+SE), MD  - Montgomery Cnty(NW), MD

WASHINGTON DC METRO AREA FORECAST DISCUSSION
High pressure will move offshore through Wednesday. A cold front will approach from the Midwest late Wednesday, then cross the northern Mid-Atlantic Thursday. The front will stall to the north across Pennsylvania keeping the local area in a warm and humid air mass through early next week.

Current DC Area Radar & North America Lightning


Northeast US Radar

Regional Radar

North America Lightning

North America Lightning Strikes
Radar image courtesy of NWS. Lightning Data courtesy of Blitzortung.org and its Contributors.
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Current Clifton Virginia Conditions & NWS Forecast

Updated: @ 21-May-2024 8:30am - next update at 8:40am  
Temperature Summary Outlook
Currently: 63.7, Max: 65.0, Min: 58.3 63.7°F
Warmer 1.5°F than last hour.

Comfortable

Feels like: 64°F

24-hr difference
2.5°FWarmer 2.5°F than yesterday at this time.
  Today Yesterday
High: 65.0°F
12:00am 		81.4°F
4:21pm
Low: 58.3°F
6:36am 		56.4°F
4:38am
High & Low May 2024
High:  91.3°F
02 May at 3:37 PM
Low:  45.0°F
11 May at 7:10 AM
Max Min:  66.0°F
07 May
Min Max:  56.9°F
04 May
High and Low 2024
High:  92.6°F
29 April at 2:44 PM
Low:  8.9°F
17 January at 7:32 AM
Max Min:  66.0°F
07 May
Min Max:  26.5°F
20 January
Record May
High:  93.7°F
at 3:47 PM on 31 May 2022
Low:  32.0°F
at 3:46 AM on 10 May 2020
Max Min:  72.0°F
at 11:59 PM on 27 May 2015
Min Max:  51.3°F
at 2:37 PM on 09 May 2020
Station All Time Record
High:  101.5°F
at 3:56 PM on 06 September 2023
Low:  1.0°F
at 7:23 AM on 23 January 2014
Max Min:  77.5°F
at 6:27 AM on 13 August 2016
Min Max:  16.7°F
at 12:04 PM on 16 February 2015
Records began on 24 December 2012
Wind Chill
Now:  63.7°F
Coldest Wind Chill
Today:  58.3°F
at 6:36am
Yesterday:  56.4°F
at 4:38am
May 2024  45.0°F
11 May at 7:10 AM
2024  3.7°F
17 January at 9:00 AM
Station May  27.4°F
at 7:06 AM on 09 May 2020
Station All Time  -15.8°F
at 1:57 AM on 21 February 2015
Records began on 24 December 2012
Degree Days
Heating Degree Days
Today: 1.4 Degree Days
Yesterday: 2.5 Degree Days
Cooling Degree Days
Today: 0.0 Degree Days
Yesterday: 4.4 Degree Days
Heat Index
Now:  63.7°F
Warmest Heat Index
Today:  65.0°F
at 00:00
Yesterday:  84.4°F
at 16:26
May 2024  94.4°F
02 May at 2:27 PM
2024  97.4°F
29 April at 2:39 PM
Station Record May  105.0°F
at 1:55 PM on 26 May 2021
Station All Time  122.6°F
at 3:16 PM on 28 July 2023
Records began on 24 December 2012
WeatherCam Thumbnail
North North West Camera
North North West WeatherCam
Few Clouds Few Clouds
Wind from ESE ESE
0.5
Gust:
 4.0 mph
0 Bft - Calm
Today: 5.0 mph 7:56am
Gust Month: 16.0 mph May 12
Rain Today:  0.00 in
Rain Rate /hr  0.00 in
Rain Last Hour:  0.00 in
Rain 24hrs:  0.00 in
Wind

Station High May 2024
High Gust:  16.0 mph
12 May at 12:01 PM
High Average:  14.0 mph
12 May at 5:00 PM
Station High 2024
High Gust:  28.0 mph
10 March at 5:26 PM
High Average:  14.0 mph
12 May at 5:00 PM
Station Record May
High Gust:  27.2 mph
at 3:33 PM on 26 May 2017
High Average:  15.1 mph
at 2:07 PM on 08 May 2016
Station All Time Record
High Gust:  42.2 mph
at 12:56 PM on 04 January 2018
High Average:  24.3 mph
at 1:07 PM on 02 March 2018
Records began on 24 December 2012
Wind Run

Today:  0.2 miles
Yesterday:  9.7 miles
Highest Wind Run
May 2024  42.0 miles
12 May
2024  106.4 miles
28 February
May  139.2 miles
on 13 May 2015
Station All Time  284.2 miles
on 02 March 2018
Records began on 24 December 2012

Rain
Rain Today: 0.00 in
Rain Rate (/hr): 0.00 in
Rain Yesterday: 0.00 in
This Month: 2.24 in
Season Total: 13.53 in
2 days since last rain.

Days Since Last Dry Day: 0
Station High May 2024
High Day:  0.55 in
04 May
High Hour:  0.30 in
12 May at 12:19 AM
High Rain Rate /hr:  2.74 in
11 May at 11:42 PM
Station High 2024
High Day:  1.53 in
09 January
High Hour:  0.33 in
28 January at 1:30 AM
High Rain Rate /hr:  2.81 in
30 April at 10:09 PM
Station Record May
High Day:  2.46 in
on 31 May 2018
High Hour:  2.16 in
at 6:26 PM on 31 May 2018
High Rain Rate /hr:  7.29 in
at 8:36 PM on 26 May 2021
Station All Time Record
High Day:  5.17 in
on 21 July 2018
High Hour:  2.21 in
at 4:13 PM on 22 July 2020
High Rain Rate /hr:  64.00 in
at 10:49 AM on 19 October 2021
High Month:  10.27 in
July 2018
Records began on 24 December 2012
WeatherCam Thumbnail
South South West Camera
South South West WeatherCam
Today

Today: Patchy Fog then Mostly Sunny
Patchy Fog then Mostly Sunny
Tonight

Tonight: Mostly Clear
Mostly Clear
Wednesday

Wednesday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 83 °F Lo 61 °F Hi 88 °F
Lightning VA MD DC WV DE

Viginia Lighting
Radar Washington DC Metro Area

GRLevel3 radar images are not available at this time.
Storm Prediction Center Activity Chart

SPC Activity

Humidity & Barometer
Humidity: 97 % Increased 1.0% since last hour.
Dew Point: 62.8°F Increased 3.7°F since last hour.
Barometer: 30.027 inHg Rising 0.01 inHg/hr
Baro Trend: Rising slowly
Today
Pressure High:  30.029 in
Pressure Low:  29.988 in
Dewpoint High:  62.8 °F
Dewpoint Low:  56.7 °F
Humidity High:  97%
Humidity Low:  92%
Station Record
Pressure High:  31.410 in
at 12:14 PM on 23 March 2017
Pressure Low:  28.987 in
at 7:41 AM on 07 February 2020
Dewpoint High:  82.0 °F
at 1:58 PM on 12 July 2021
Dewpoint Low:  -27.0 °F
at 1:57 AM on 20 February 2015
Records began on 24 December 2012
Snow

Snow Depth: 0.0 in
Snowfall Today: No Snow Today
Storm Total: 0.0 in
Total Season Snow: 10.00 in
Total Last Season: 0.0 in
Fire Danger
firedanger
Almanac
Sunrise: 5:51am
Sunset: 8:20pm
Moonset: 4:30am
Moonrise: 6:47pm

Day Length:  14:28
Dawn:  05:22
Dusk:  20:51
Daylight Length:  15:29
 There will be 1min 35s more daylight tomorrow

Cloud Base

cloudbase
CB: 204 ft
UV Index

   1.1   
 Low 
High: 1.1 @ 8:29am

Solar Radiation
262 W/m2
High: 262 @  8:29am

Air Quality Index
Current AQI
54
Moderate

Sunlight

14 hrs 28 min 54 sec
of Sunlight Today
Which is
1 min 32 sec Longer
Than Yesterday
(Noon) graph (Midnight)
 Legend

Moon


Waxing Gibbous
Waxing Gibbous, Moon at 12 days in cycle
96% %
Illuminated
Trends
These graphs present the temperature, pressure, rainfall, and wind speed trends for the last 24 hours.
The thumbnail graphs are sampled every ten minutes.
The large graphs are sampled every minute.
Weather Graphs
Click on weather description tab below to display the corresponding graph in the panel above.
Wind Graph Thumbnail Wind Direction Thumbnail Temperature Graph Thumbnail Temp Min/Max Graph Thumbnail Humidity Graph Thumbnail Pressure Graph Thumbnail
Today's Rainfall Graph Thumbnail Rain Graph Thumbnail Daily Rain Graph Thumbnail Solar Radiation Graph Thumbnail UV Index Graph Thumbnail Sunshine Hours Graph Thumbnail
 NWS Weather Forecast  - Outlook: Today & Tonight
Today

Today: Patchy Fog then Mostly Sunny
Patchy Fog then Mostly Sunny

Hi 83 °F		 NWS forecast: Patchy fog before 8am. Mostly sunny, with a high near 83. South wind 2 to 8 mph.
Davis VP+ forecast: Increasing clouds with little temperature change. Precipitation possible within 24 to 48 hours		   Tonight

Tonight: Mostly Clear
Mostly Clear

Lo 61 °F		 NWS forecast: Mostly clear, with a low around 61. South wind 5 to 8 mph.
 NWS Weather Forecast  - Five Day Outlook for Today through Saturday - Last Update: Tue, 21-May-2024 7:29am EDT
Today

Today: Patchy Fog then Mostly Sunny
Patchy Fog then Mostly Sunny
Tonight

Tonight: Mostly Clear
Mostly Clear
Wednesday

Wednesday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Wednesday
Night
Wednesday Night: Slight Chance Showers And Thunderstorms then Mostly Cloudy
Slight Chance Showers And T-Storms then Mostly Cloudy
Thursday

Thursday: Mostly Cloudy then Showers And Thunderstorms Likely
Mostly Cloudy then Showers And T-Storms Likely
Thursday
Night
Thursday Night: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Friday

Friday: Chance Rain Showers then Chance Showers And Thunderstorms
Chance Rain Showers then Chance Showers And T-Storms
Friday
Night
Friday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Saturday

Saturday: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Hi 83 °F Lo 61 °F Hi 88 °F Lo 68 °F Hi 85 °F Lo 65 °F Hi 83 °F Lo 64 °F Hi 79 °F

NWS Forecast Maps

NOAA Forecast Map for Today

Forecast Map for Today

NOAA Forecast Map for Tomorrow

Forecast Map for Tomorrow
Forecast map for Today courtesy of NOAA. Forecast map for Tomorrow courtesy of NOAA.

Random Weather Facts

Clouds
Mostly sunny and mostly clear indicate the same amount of cloud coverage - about 25 percent. Mostly sunny is used during the daytime, and mostly clear is used at night when there is no sun.

Today in Weather History

Weather History for May 21
 
1957   A canceled check was found in Ottumwa, IA blown all the way from Hickman Mills, a Kansas City suburb, by an F5 multi-vortex tornado. That's nearly 200 miles.
1957   An F5 tornado touched down southwest of Kansas City, then traveled 71 miles through the suburbs. The tornado killed 45 people and left a path of near-total destruction in its wake. All that remained at one house was a small table with a fish bowl sitting on top, with the fish still swimming inside.